Hold back some packages on apt-get upgrade - how? ; gre

[giovanni_re]

Running 10.04, with firefox installed from the ppa. cause that's more
recent than the ff 3 in 10.04


ff is the "nightly" build, from the ppa - but, I don't want to have to
update it every day.

So, how can I tell apt to upgrade everything but ff "nightly"?

Thanks :)


-----
apt-get -d dist-upgrade
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
The following NEW packages will be installed:
  linux-image-2.6.32-32-generic
The following packages will be upgraded:
  bind9-host dnsutils firefox-4.0 firefox-4.0-dbg firefox-trunk
  firefox-trunk-dbg firefox-trunk-globalmenu gnome-user-guide
  ksystemlog language-selector-common language-selector-qt libapr1
  libbind9-60 libdbus-glib-1-2 libdns64 libisc60 libisccc60
  libisccfg60 liblwres60 libnm-glib2 libnm-util1 libpam-modules
  libpam-runtime libpam0g libsmbclient libwbclient0 linux-generic
  linux-image-generic linux-libc-dev modemmanager network-manager
  rdesktop samba-common samba-common-bin smbclient
  system-config-printer-kde xulrunner-1.9.2
37 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 195MB/206MB of archives.
After this operation, 159MB of additional disk space will be used.
Do you want to continue [Y/n]? y
WARNING: The following packages cannot be authenticated!
  firefox-trunk-dbg firefox-trunk-globalmenu firefox-trunk firefox-4.0
  firefox-4.0-dbg xulrunner-1.9.2
Install these packages without verification [y/N]? n
E: Some packages could not be authenticated


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